texindex --version (return code: 0)
texindex (GNU texinfo) 6.4.90
Copyright (C) 2017 Free Software Foundation, Inc.
License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>
This is free software: you are free to change and redistribute it.
There is NO WARRANTY, to the extent permitted by law.
texindex --help (return code: 0)
Usage: /usr/bin/texindex [OPTION]... FILE...
Generate a sorted index for each TeX output FILE.
Usually FILE... is specified as `foo.??' for a document `foo.texi'.
Options:
-h, --help display this help and exit
--version display version information and exit
-- end option processing
Email bug reports to bug-texinfo@gnu.org,
general questions and discussion to help-texinfo@gnu.org.
Texinfo home page: http://www.gnu.org/software/texinfo/